Working on a short story, play, or screenplay? Unable to find an appropriate pivotal event for your final act?
Look no further. I give you Harvet Ismuth's 42 Essential 3rd Act Twists (As performed by the Ellis Island Community Players)
Choose your genre—Tragedy? Sci-fi? Thriller?—and you'll find a number of pertinent suggestions for your third-act plot twist. They're arranged in nice thematic categories for you, ranging from the Petard Hoist ("Food starts eating people.") to the Shyamalan ("Devil deal backfires.") to the nefarious Double Shyamalan ("Devil actually autistic boy.").